diff --git a/services/platform-service/src/modules/api-versioning/api-versioning.test.ts b/services/platform-service/src/modules/api-versioning/api-versioning.test.ts
new file mode 100644
index 00000000..4fb67139
--- /dev/null
+++ b/services/platform-service/src/modules/api-versioning/api-versioning.test.ts
@@ -0,0 +1,142 @@
+/**
+ * API Versioning module — unit tests.
+ */
+
+import { describe, it, expect } from 'vitest';
+import {
+  CreateApiVersionSchema,
+  UpdateApiVersionSchema,
+  PinClientVersionSchema,
+  UpdateClientPinSchema,
+} from './types.js';
+
+describe('CreateApiVersionSchema', () => {
+  it('validates minimal version', () => {
+    const result = CreateApiVersionSchema.safeParse({
+      version: 'v1',
+      label: 'Initial Release',
+    });
+    expect(result.success).toBe(true);
+    if (result.success) {
+      expect(result.data.status).toBe('draft');
+      expect(result.data.breakingChanges).toEqual([]);
+    }
+  });
+
+  it('validates with all fields', () => {
+    const result = CreateApiVersionSchema.safeParse({
+      version: '2024-01-15',
+      label: 'January 2024 Release',
+      status: 'active',
+      releasedAt: '2024-01-15T00:00:00.000Z',
+      migrationGuide: '# Migration from v1\n\n- Rename field X to Y',
+      breakingChanges: ['Renamed /users to /accounts', 'Changed auth flow'],
+      addedEndpoints: ['POST /api/widgets', 'GET /api/widgets/:id'],
+      removedEndpoints: ['DELETE /api/legacy'],
+      modifiedEndpoints: ['PATCH /api/users → PATCH /api/accounts'],
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('rejects invalid version chars', () => {
+    expect(CreateApiVersionSchema.safeParse({ version: 'v1 beta', label: 'Test' }).success).toBe(
+      false
+    );
+  });
+
+  it('rejects empty version', () => {
+    expect(CreateApiVersionSchema.safeParse({ version: '', label: 'Test' }).success).toBe(false);
+  });
+
+  it('rejects invalid status', () => {
+    expect(
+      CreateApiVersionSchema.safeParse({ version: 'v1', label: 'Test', status: 'archived' }).success
+    ).toBe(false);
+  });
+
+  it('validates date-based version', () => {
+    const result = CreateApiVersionSchema.safeParse({
+      version: '2025-06-01',
+      label: 'June 2025',
+    });
+    expect(result.success).toBe(true);
+  });
+});
+
+describe('UpdateApiVersionSchema', () => {
+  it('validates partial update', () => {
+    const result = UpdateApiVersionSchema.safeParse({
+      status: 'deprecated',
+      deprecatedAt: '2024-06-01T00:00:00.000Z',
+      sunsetAt: '2024-12-01T00:00:00.000Z',
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('validates migration guide update', () => {
+    expect(
+      UpdateApiVersionSchema.safeParse({
+        migrationGuide: '# New migration steps\n\nFollow these steps...',
+      }).success
+    ).toBe(true);
+  });
+
+  it('validates null deprecatedAt (to clear)', () => {
+    expect(UpdateApiVersionSchema.safeParse({ deprecatedAt: null }).success).toBe(true);
+  });
+});
+
+describe('PinClientVersionSchema', () => {
+  it('validates minimal pin', () => {
+    const result = PinClientVersionSchema.safeParse({
+      clientId: 'app-ios-v3',
+      pinnedVersion: 'v1',
+      reason: 'Legacy iOS app needs v1 until next release',
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('validates with auto-upgrade', () => {
+    const result = PinClientVersionSchema.safeParse({
+      clientId: 'api-key-xyz',
+      pinnedVersion: '2024-01-15',
+      reason: 'Partner integration locked to January version',
+      autoUpgradeAt: '2025-01-01T00:00:00.000Z',
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('rejects empty clientId', () => {
+    expect(
+      PinClientVersionSchema.safeParse({
+        clientId: '',
+        pinnedVersion: 'v1',
+        reason: 'test',
+      }).success
+    ).toBe(false);
+  });
+
+  it('rejects empty reason', () => {
+    expect(
+      PinClientVersionSchema.safeParse({
+        clientId: 'app-1',
+        pinnedVersion: 'v1',
+        reason: '',
+      }).success
+    ).toBe(false);
+  });
+});
+
+describe('UpdateClientPinSchema', () => {
+  it('validates version change', () => {
+    expect(UpdateClientPinSchema.safeParse({ pinnedVersion: 'v2' }).success).toBe(true);
+  });
+
+  it('validates reason change', () => {
+    expect(UpdateClientPinSchema.safeParse({ reason: 'Updated integration' }).success).toBe(true);
+  });
+
+  it('validates null autoUpgradeAt (to clear)', () => {
+    expect(UpdateClientPinSchema.safeParse({ autoUpgradeAt: null }).success).toBe(true);
+  });
+});
diff --git a/services/platform-service/src/modules/api-versioning/repository.ts b/services/platform-service/src/modules/api-versioning/repository.ts
new file mode 100644
index 00000000..14185826
--- /dev/null
+++ b/services/platform-service/src/modules/api-versioning/repository.ts
@@ -0,0 +1,213 @@
+/**
+ * API Versioning repository — Cosmos DB CRUD for versions and client pins.
+ * @module api-versioning/repository
+ */
+
+import { getContainer } from '../../lib/cosmos.js';
+import type { ApiVersionDoc, ClientVersionPinDoc, VersionStatus } from './types.js';
+
+// =============================================================================
+// API Versions
+// =============================================================================
+
+export async function createVersion(doc: ApiVersionDoc): Promise<ApiVersionDoc> {
+  const container = getContainer('api_versions');
+  const { resource } = await container.items.create(doc);
+  if (!resource) throw new Error('Failed to create API version');
+  return resource as unknown as ApiVersionDoc;
+}
+
+export async function getVersion(id: string, productId: string): Promise<ApiVersionDoc | null> {
+  const container = getContainer('api_versions');
+  try {
+    const { resource } = await container.item(id, productId).read();
+    return resource as unknown as ApiVersionDoc | null;
+  } catch (err) {
+    if ((err as { code?: number }).code === 404) return null;
+    throw err;
+  }
+}
+
+export async function getVersionByString(
+  productId: string,
+  version: string
+): Promise<ApiVersionDoc | null> {
+  const container = getContainer('api_versions');
+  const query = 'SELECT * FROM c WHERE c.productId = @productId AND c.version = @version';
+  const parameters = [
+    { name: '@productId', value: productId },
+    { name: '@version', value: version },
+  ];
+  const { resources } = await container.items
+    .query<ApiVersionDoc>({ query, parameters })
+    .fetchAll();
+  return resources[0] ?? null;
+}
+
+export async function updateVersion(
+  id: string,
+  productId: string,
+  updates: Partial<ApiVersionDoc>
+): Promise<ApiVersionDoc | null> {
+  const existing = await getVersion(id, productId);
+  if (!existing) return null;
+
+  const container = getContainer('api_versions');
+  const updated: ApiVersionDoc = {
+    ...existing,
+    ...updates,
+    id: existing.id,
+    productId: existing.productId,
+    updatedAt: new Date().toISOString(),
+  };
+
+  const { resource } = await container.items.upsert(updated);
+  if (!resource) throw new Error('Failed to update API version');
+  return resource as unknown as ApiVersionDoc;
+}
+
+export async function listVersions(
+  productId: string,
+  options?: { status?: VersionStatus; limit?: number }
+): Promise<{ versions: ApiVersionDoc[]; total: number }> {
+  const container = getContainer('api_versions');
+
+  let query = 'SELECT * FROM c WHERE c.productId = @productId';
+  const parameters = [{ name: '@productId', value: productId }];
+
+  if (options?.status) {
+    query += ' AND c.status = @status';
+    parameters.push({ name: '@status', value: options.status });
+  }
+
+  query += ' ORDER BY c.createdAt DESC';
+
+  const countQuery = query.replace('SELECT *', 'SELECT VALUE COUNT(1)');
+  const { resources: countResult } = await container.items
+    .query<number>({ query: countQuery, parameters })
+    .fetchAll();
+  const total = countResult[0] ?? 0;
+
+  const safeLimit = Math.min(Math.max(options?.limit ?? 50, 1), 200);
+  query += ` OFFSET 0 LIMIT ${safeLimit}`;
+
+  const { resources } = await container.items
+    .query<ApiVersionDoc>({ query, parameters })
+    .fetchAll();
+
+  return { versions: resources, total };
+}
+
+export async function getActiveVersion(productId: string): Promise<ApiVersionDoc | null> {
+  const container = getContainer('api_versions');
+  const query =
+    'SELECT * FROM c WHERE c.productId = @productId AND c.status = "active" ORDER BY c.releasedAt DESC';
+  const parameters = [{ name: '@productId', value: productId }];
+  const { resources } = await container.items
+    .query<ApiVersionDoc>({ query, parameters })
+    .fetchAll();
+  return resources[0] ?? null;
+}
+
+export async function deleteVersion(id: string, productId: string): Promise<boolean> {
+  const container = getContainer('api_versions');
+  try {
+    await container.item(id, productId).delete();
+    return true;
+  } catch (err) {
+    if ((err as { code?: number }).code === 404) return false;
+    throw err;
+  }
+}
+
+// =============================================================================
+// Client Version Pins
+// =============================================================================
+
+export async function createPin(doc: ClientVersionPinDoc): Promise<ClientVersionPinDoc> {
+  const container = getContainer('api_version_pins');
+  const { resource } = await container.items.create(doc);
+  if (!resource) throw new Error('Failed to create version pin');
+  return resource as unknown as ClientVersionPinDoc;
+}
+
+export async function getPin(
+  clientId: string,
+  productId: string
+): Promise<ClientVersionPinDoc | null> {
+  const container = getContainer('api_version_pins');
+  const query = 'SELECT * FROM c WHERE c.productId = @productId AND c.clientId = @clientId';
+  const parameters = [
+    { name: '@productId', value: productId },
+    { name: '@clientId', value: clientId },
+  ];
+  const { resources } = await container.items
+    .query<ClientVersionPinDoc>({ query, parameters })
+    .fetchAll();
+  return resources[0] ?? null;
+}
+
+export async function updatePin(
+  id: string,
+  productId: string,
+  updates: Partial<ClientVersionPinDoc>
+): Promise<ClientVersionPinDoc | null> {
+  const container = getContainer('api_version_pins');
+  try {
+    const { resource: existing } = await container.item(id, productId).read();
+    if (!existing) return null;
+    const updated = {
+      ...existing,
+      ...updates,
+      updatedAt: new Date().toISOString(),
+    };
+    const { resource } = await container.items.upsert(updated);
+    return resource as unknown as ClientVersionPinDoc;
+  } catch (err) {
+    if ((err as { code?: number }).code === 404) return null;
+    throw err;
+  }
+}
+
+export async function deletePin(id: string, productId: string): Promise<boolean> {
+  const container = getContainer('api_version_pins');
+  try {
+    await container.item(id, productId).delete();
+    return true;
+  } catch (err) {
+    if ((err as { code?: number }).code === 404) return false;
+    throw err;
+  }
+}
+
+export async function listPins(
+  productId: string,
+  options?: { version?: string; limit?: number }
+): Promise<{ pins: ClientVersionPinDoc[]; total: number }> {
+  const container = getContainer('api_version_pins');
+
+  let query = 'SELECT * FROM c WHERE c.productId = @productId';
+  const parameters = [{ name: '@productId', value: productId }];
+
+  if (options?.version) {
+    query += ' AND c.pinnedVersion = @version';
+    parameters.push({ name: '@version', value: options.version });
+  }
+
+  query += ' ORDER BY c.createdAt DESC';
+
+  const countQuery = query.replace('SELECT *', 'SELECT VALUE COUNT(1)');
+  const { resources: countResult } = await container.items
+    .query<number>({ query: countQuery, parameters })
+    .fetchAll();
+  const total = countResult[0] ?? 0;
+
+  const safeLimit = Math.min(Math.max(options?.limit ?? 50, 1), 200);
+  query += ` OFFSET 0 LIMIT ${safeLimit}`;
+
+  const { resources } = await container.items
+    .query<ClientVersionPinDoc>({ query, parameters })
+    .fetchAll();
+
+  return { pins: resources, total };
+}
diff --git a/services/platform-service/src/modules/api-versioning/routes.ts b/services/platform-service/src/modules/api-versioning/routes.ts
new file mode 100644
index 00000000..d71981cb
--- /dev/null
+++ b/services/platform-service/src/modules/api-versioning/routes.ts
@@ -0,0 +1,217 @@
+/**
+ * API Versioning routes — version lifecycle, client pins, deprecation.
+ * @module api-versioning/routes
+ */
+
+import type { FastifyInstance } from 'fastify';
+import {
+  UnauthorizedError,
+  ForbiddenError,
+  NotFoundError,
+  ConflictError,
+} from '../../lib/errors.js';
+import { getRequestProductId } from '../../lib/request-context.js';
+import {
+  CreateApiVersionSchema,
+  UpdateApiVersionSchema,
+  PinClientVersionSchema,
+  UpdateClientPinSchema,
+  type VersionStatus,
+} from './types.js';
+import * as repo from './repository.js';
+
+function requireAuth(req: { jwtPayload?: { sub: string } }): string {
+  if (!req.jwtPayload?.sub) throw new UnauthorizedError('Authentication required');
+  return req.jwtPayload.sub;
+}
+
+function requireAdmin(req: { jwtPayload?: { sub: string; role?: string } }): string {
+  const userId = requireAuth(req);
+  if (req.jwtPayload?.role !== 'admin') throw new ForbiddenError('Admin access required');
+  return userId;
+}
+
+export async function apiVersioningRoutes(app: FastifyInstance): Promise<void> {
+  // ── Create version ─────────────────────────────────────────
+  app.post('/api-versions', async (req, reply) => {
+    const userId = requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const input = CreateApiVersionSchema.parse(req.body);
+
+    // Check uniqueness
+    const existing = await repo.getVersionByString(productId, input.version);
+    if (existing) {
+      throw new ConflictError(`API version "${input.version}" already exists`);
+    }
+
+    const now = new Date().toISOString();
+    const doc = {
+      id: `ver_${Date.now()}_${Math.random().toString(36).slice(2, 7)}`,
+      productId,
+      version: input.version,
+      status: input.status,
+      label: input.label,
+      releasedAt: input.releasedAt ?? null,
+      deprecatedAt: null,
+      sunsetAt: null,
+      migrationGuide: input.migrationGuide ?? null,
+      breakingChanges: input.breakingChanges,
+      addedEndpoints: input.addedEndpoints,
+      removedEndpoints: input.removedEndpoints,
+      modifiedEndpoints: input.modifiedEndpoints,
+      createdAt: now,
+      updatedAt: now,
+      updatedBy: userId,
+    };
+
+    const created = await repo.createVersion(doc);
+    req.log.info({ versionId: created.id, version: input.version }, 'API version created');
+    reply.status(201);
+    return created;
+  });
+
+  // ── List versions ──────────────────────────────────────────
+  app.get('/api-versions', async req => {
+    requireAuth(req);
+    const productId = getRequestProductId(req);
+    const { status, limit: limitStr } = req.query as { status?: string; limit?: string };
+    const parsedLimit = limitStr ? parseInt(limitStr, 10) : 50;
+    const safeLimit =
+      Number.isFinite(parsedLimit) && parsedLimit > 0 ? Math.min(parsedLimit, 200) : 50;
+
+    return repo.listVersions(productId, {
+      status: status as VersionStatus | undefined,
+      limit: safeLimit,
+    });
+  });
+
+  // ── Get current active version ─────────────────────────────
+  app.get('/api-versions/current', async req => {
+    requireAuth(req);
+    const productId = getRequestProductId(req);
+    const active = await repo.getActiveVersion(productId);
+    if (!active) throw new NotFoundError('No active API version found');
+    return active;
+  });
+
+  // ── Get version ────────────────────────────────────────────
+  app.get<{ Params: { id: string } }>('/api-versions/:id', async req => {
+    requireAuth(req);
+    const productId = getRequestProductId(req);
+    const version = await repo.getVersion(req.params.id, productId);
+    if (!version) throw new NotFoundError('API version not found');
+    return version;
+  });
+
+  // ── Update version ─────────────────────────────────────────
+  app.patch<{ Params: { id: string } }>('/api-versions/:id', async req => {
+    const userId = requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const input = UpdateApiVersionSchema.parse(req.body);
+
+    const updated = await repo.updateVersion(req.params.id, productId, {
+      ...input,
+      updatedBy: userId,
+    });
+    if (!updated) throw new NotFoundError('API version not found');
+
+    req.log.info({ versionId: req.params.id, status: input.status }, 'API version updated');
+    return updated;
+  });
+
+  // ── Delete version (draft only) ────────────────────────────
+  app.delete<{ Params: { id: string } }>('/api-versions/:id', async (req, reply) => {
+    requireAdmin(req);
+    const productId = getRequestProductId(req);
+
+    const version = await repo.getVersion(req.params.id, productId);
+    if (!version) throw new NotFoundError('API version not found');
+    if (version.status !== 'draft') {
+      throw new ConflictError('Only draft versions can be deleted');
+    }
+
+    await repo.deleteVersion(req.params.id, productId);
+    req.log.info({ versionId: req.params.id }, 'API version deleted');
+    reply.status(204);
+    return;
+  });
+
+  // ── Pin client to version ──────────────────────────────────
+  app.post('/api-versions/pins', async (req, reply) => {
+    const userId = requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const input = PinClientVersionSchema.parse(req.body);
+
+    // Verify version exists
+    const version = await repo.getVersionByString(productId, input.pinnedVersion);
+    if (!version) throw new NotFoundError(`API version "${input.pinnedVersion}" not found`);
+
+    // Check for existing pin
+    const existing = await repo.getPin(input.clientId, productId);
+    if (existing) {
+      throw new ConflictError(`Client "${input.clientId}" already has a version pin`);
+    }
+
+    const now = new Date().toISOString();
+    const doc = {
+      id: `pin_${Date.now()}_${Math.random().toString(36).slice(2, 7)}`,
+      productId,
+      clientId: input.clientId,
+      pinnedVersion: input.pinnedVersion,
+      reason: input.reason,
+      autoUpgradeAt: input.autoUpgradeAt ?? null,
+      createdAt: now,
+      updatedAt: now,
+      updatedBy: userId,
+    };
+
+    const created = await repo.createPin(doc);
+    req.log.info(
+      { clientId: input.clientId, version: input.pinnedVersion },
+      'Client version pinned'
+    );
+    reply.status(201);
+    return created;
+  });
+
+  // ── List pins ──────────────────────────────────────────────
+  app.get('/api-versions/pins', async req => {
+    requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const { version, limit: limitStr } = req.query as { version?: string; limit?: string };
+    const parsedLimit = limitStr ? parseInt(limitStr, 10) : 50;
+    const safeLimit =
+      Number.isFinite(parsedLimit) && parsedLimit > 0 ? Math.min(parsedLimit, 200) : 50;
+
+    return repo.listPins(productId, { version, limit: safeLimit });
+  });
+
+  // ── Update pin ─────────────────────────────────────────────
+  app.patch<{ Params: { id: string } }>('/api-versions/pins/:id', async req => {
+    const userId = requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const input = UpdateClientPinSchema.parse(req.body);
+
+    const updated = await repo.updatePin(req.params.id, productId, {
+      ...input,
+      updatedBy: userId,
+    });
+    if (!updated) throw new NotFoundError('Version pin not found');
+
+    req.log.info({ pinId: req.params.id }, 'Version pin updated');
+    return updated;
+  });
+
+  // ── Delete pin ─────────────────────────────────────────────
+  app.delete<{ Params: { id: string } }>('/api-versions/pins/:id', async (req, reply) => {
+    requireAdmin(req);
+    const productId = getRequestProductId(req);
+
+    const deleted = await repo.deletePin(req.params.id, productId);
+    if (!deleted) throw new NotFoundError('Version pin not found');
+
+    req.log.info({ pinId: req.params.id }, 'Version pin deleted');
+    reply.status(204);
+    return;
+  });
+}
diff --git a/services/platform-service/src/modules/api-versioning/types.ts b/services/platform-service/src/modules/api-versioning/types.ts
new file mode 100644
index 00000000..8a209340
--- /dev/null
+++ b/services/platform-service/src/modules/api-versioning/types.ts
@@ -0,0 +1,105 @@
+/**
+ * API Versioning module — types and schemas.
+ * Manages API version lifecycle, deprecation notices, migration guides,
+ * and per-client version pinning.
+ */
+
+import { z } from 'zod';
+
+// ── API Version Types ────────────────────────────────────────────
+
+export type VersionStatus = 'draft' | 'active' | 'deprecated' | 'sunset';
+
+export interface ApiVersionDoc {
+  id: string;
+  productId: string;
+  /** Version string (e.g. "v1", "v2", "2024-01-15") */
+  version: string;
+  status: VersionStatus;
+  /** Human-readable label */
+  label: string;
+  /** Release date */
+  releasedAt: string | null;
+  /** Deprecation date (when deprecated notice starts) */
+  deprecatedAt: string | null;
+  /** Sunset date (when version is removed) */
+  sunsetAt: string | null;
+  /** Migration guide URL or inline markdown */
+  migrationGuide: string | null;
+  /** Breaking changes summary */
+  breakingChanges: string[];
+  /** Endpoints added in this version */
+  addedEndpoints: string[];
+  /** Endpoints removed in this version */
+  removedEndpoints: string[];
+  /** Endpoints modified in this version */
+  modifiedEndpoints: string[];
+  createdAt: string;
+  updatedAt: string;
+  updatedBy: string;
+}
+
+export interface ClientVersionPinDoc {
+  id: string;
+  productId: string;
+  /** Client identifier (API key ID, app ID, or user ID) */
+  clientId: string;
+  /** Pinned version */
+  pinnedVersion: string;
+  /** Why the client is pinned (e.g. "Legacy integration") */
+  reason: string;
+  /** Auto-upgrade after this date */
+  autoUpgradeAt: string | null;
+  createdAt: string;
+  updatedAt: string;
+  updatedBy: string;
+}
+
+// ── Schemas ──────────────────────────────────────────────────────
+
+export const CreateApiVersionSchema = z.object({
+  version: z
+    .string()
+    .min(1)
+    .max(32)
+    .regex(/^[a-zA-Z0-9._-]+$/, 'Version must be alphanumeric with dots, hyphens, underscores'),
+  label: z.string().min(1).max(200),
+  status: z.enum(['draft', 'active', 'deprecated', 'sunset']).default('draft'),
+  releasedAt: z.string().datetime().nullable().optional(),
+  migrationGuide: z.string().max(5000).nullable().optional(),
+  breakingChanges: z.array(z.string().max(500)).max(50).default([]),
+  addedEndpoints: z.array(z.string().max(200)).max(100).default([]),
+  removedEndpoints: z.array(z.string().max(200)).max(100).default([]),
+  modifiedEndpoints: z.array(z.string().max(200)).max(100).default([]),
+});
+
+export const UpdateApiVersionSchema = z.object({
+  label: z.string().min(1).max(200).optional(),
+  status: z.enum(['draft', 'active', 'deprecated', 'sunset']).optional(),
+  releasedAt: z.string().datetime().nullable().optional(),
+  deprecatedAt: z.string().datetime().nullable().optional(),
+  sunsetAt: z.string().datetime().nullable().optional(),
+  migrationGuide: z.string().max(5000).nullable().optional(),
+  breakingChanges: z.array(z.string().max(500)).max(50).optional(),
+  addedEndpoints: z.array(z.string().max(200)).max(100).optional(),
+  removedEndpoints: z.array(z.string().max(200)).max(100).optional(),
+  modifiedEndpoints: z.array(z.string().max(200)).max(100).optional(),
+});
+
+export const PinClientVersionSchema = z.object({
+  clientId: z.string().min(1).max(128),
+  pinnedVersion: z.string().min(1).max(32),
+  reason: z.string().min(1).max(500),
+  autoUpgradeAt: z.string().datetime().nullable().optional(),
+});
+
+export const UpdateClientPinSchema = z.object({
+  pinnedVersion: z.string().min(1).max(32).optional(),
+  reason: z.string().min(1).max(500).optional(),
+  autoUpgradeAt: z.string().datetime().nullable().optional(),
+});
+
+export type CreateApiVersionInput = z.infer<typeof CreateApiVersionSchema>;
+export type UpdateApiVersionInput = z.infer<typeof UpdateApiVersionSchema>;
+export type PinClientVersionInput = z.infer<typeof PinClientVersionSchema>;
+export type UpdateClientPinInput = z.infer<typeof UpdateClientPinSchema>;